linux-kernel - Re: [RFC PATCH 00/32] Nohz cpusets (was: Nohz Tasks)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAOtvUMdWu9KUk+ZxOcwEucJ2DHqKEQLuJFpMj1qYkuOeCb=OEQ@mail.gmail.com>
Date:	Wed, 31 Aug 2011 17:05:02 +0300
From:	Gilad Ben-Yossef <gilad@...yossef.com>
To:	Mike Galbraith <efault@....de>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Anton Blanchard <anton@....ibm.com>,
	Avi Kivity <avi@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tim Pepper <lnxninja@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH 00/32] Nohz cpusets (was: Nohz Tasks)

> Guess I'll have to try creating a cpuset per cpu, and see how it
> compares to isolcpus.  cset shield --cpu 4-63 didn't work well enough.

Try adding:

# cset shield --kthread on

It will try to move non bound kernel threads to the system set from
the root set.

The results seems to vary from introducing system instability, via
doing nothing at all, all the way to actually achieving better
isolation, depending on the specific kernel threads you have running
and your kernel version. Sometime more then one of the results at the
same time. It's really like Russian roulette in a way, only way more
geekier...

-- 
Gilad Ben-Yossef
Chief Coffee Drinker
gilad@...yossef.com
Israel Cell: +972-52-8260388
US Cell: +1-973-8260388
http://benyossef.com
"Dance like no one is watching, love like you'll never be hurt, sing
like no one is listening... but for BEEP sake you better code like
you're going to maintain it for years!"
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/